#region (c) 2014 THN Solutions LLC. - All rights reserved
/*
Simplified BSD License (BSD)
Copyright (c) 2014, THN Solutions LLC. ( www.ThnSolutions.com )
Author: Nguyễn, M. Hải                 ( www.Minh-Hai.com     )
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this 
      list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright notice, 
      this list of conditions and the following disclaimer in the documentation 
      and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
POSSIBILITY OF SUCH DAMAGE.
*/
#endregion

#region Record of Change
//             							CHANGE HISTORY
// -------------------------------------------------------------------------------------
// |   DATE    | DEVELOPER  | DESCRIPTION                                              |
// -------------------------------------------------------------------------------------
// | 12-Nov-09 | HaiNM      | First creation.                                          |
// -------------------------------------------------------------------------------------
//
#endregion

#region Record of Audit
//             							REVIEW HISTORY
// -------------------------------------------------------------------------------------
// |   DATE    | REVIEWER   | NOTES                                                    |
// -------------------------------------------------------------------------------------
// -------------------------------------------------------------------------------------
//
#endregion

#region Using directives
using System;
using System.Threading;

using Thn;
#endregion

namespace Thn.Interface.Vcl
{
    /// <summary>
    /// Singleton access to page manager
    /// </summary>
#if DEBUG
    public
#else
    public
#endif
 class PageManagerFactory
    {
        #region Manager
        IPageManager mManager;
        /// <summary>
        /// Gets/Sets main page manager
        /// </summary>
        public static IPageManager Manager
        {
            get { return Instance.mManager; }
            set { Instance.mManager = value; }
        }
        #endregion

        #region Queue Work
        ///// <summary>
        ///// Queue a new work item
        ///// </summary>
        ///// <param name="work">delegate to the work code</param>
        ///// <param name="state">starting state to assign to the work</param>
        //public static IWorkItemResult QueueWork(WorkItemCallback work, object state)
        //{
            
        //    return Instance.DoQueueWork(work, state);
        //}

        ///// <summary>
        ///// Queque a new work item
        ///// </summary>
        ///// <param name="work">delegate to the work code</param>
        ///// <param name="state">starting state to assign to the work</param>
        ///// <param name="postWork">delegate to the after-work code</param>
        //public static IWorkItemResult QueueWork(WorkItemCallback work, object state, PostExecuteWorkItemCallback postWork)
        //{
        //    return Instance.DoQueueWork(work, state, postWork);
        //}

        //IWorkItemResult DoQueueWork(WorkItemCallback work, object state)
        //{
        //    WaitablePageManager man = (WaitablePageManager)mManager;
        //    return man.QueueWork(work, state);
        //}

        //IWorkItemResult DoQueueWork(WorkItemCallback work, object state, PostExecuteWorkItemCallback postWork)
        //{
        //    WaitablePageManager man = (WaitablePageManager)mManager;
        //    return man.QueueWork(work, state, postWork);
        //}
        #endregion

        #region Instance
        /// <summary>
        /// Static variable for thread locking
        /// </summary>
        static object SyncRoot = new object();

        /// <summary>
        /// Actual static variable for Instance
        /// </summary>
        static PageManagerFactory mInstance = null;

        /// <summary>
        /// Gets the static instance of this class
        /// </summary>
        static PageManagerFactory Instance
        {
            get
            {
                if (mInstance == null)
                {
                    //initialize new instance
                    PageManagerFactory tmp = new PageManagerFactory();

                    //assign to static variable. Lock root for thread-safe locking
                    lock (SyncRoot)
                    {
                        mInstance = tmp;
                    }
                }

                return mInstance;
            }
        }

        //private constructor
        PageManagerFactory() { }
        #endregion
    }
}
